To be certain, you should:
* Consult your owner's manual: This is the best resource for the exact location specific to your vehicle.
* Look for a cylindrical metal canister: The fuel filter is typically a metallic canister, although some aftermarket filters might be plastic.
* Check online forums: Searching for "1998 Chevy Blazer fuel filter location" on forums like Chevrolet forums or general automotive forums will likely yield photos and descriptions from other owners.
Remember to take appropriate safety precautions when working near fuel systems – avoid sparks and open flames.